# US 11,898,092 B2 · Composition useful in sulfate scale removal

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- Number: US 11,898,092 B2
- Document ID: US11898092B2
- Status: Granted
- Kind: B2
- Application number: 17/714,709
- Filed: 2022-04-06
- Published: 2022-10-13
- Granted: 2024-02-13
- Earliest claimed: 2021-04-09
- Assignees: Dorf Ketal Chemicals Fze
- Applicants: Fluid Energy Group Ltd.
- Inventors: Clay Purdy; Markus Weissenberger; Stig Magnor Nordaa; Elsayed Abdelfatah
- Web page: https://patentgrep.com/patent/US11898092B2

## CPC

- C09K 8/528: inorganic depositions, e.g. sulfates or carbonates
- C09K 8/584: characterised by the use of specific surfactants
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

The present invention discloses a novel aqueous composition for use in removing petroleum-contaminated barium sulfate scale from a surface contaminated with such, said composition comprising: a chelating agent and a counterion component selected from the group consisting of: Li5DTPA; Na5DTPA; K5DTPA; Cs5DTPA; Na4EDTA; K4EDTA; TEAH4DTPA; and TBAH5DTPA; a scale removal enhancer; a non-ionic surfactant; and a hydrotrope. There is also disclosed methods to use such compositions.

## Claims

### Claim 1

An aqueous composition for use in removing petroleum-contaminated barium sulfate scale from a surface contaminated with the same, said composition comprising:
a chelating agent and a counterion component selected from the group consisting of: Li5DTPA; Na5DTPA; K5DTPA; Cs5DTPA; Na4EDTA; K4EDTA; TEAH4DTPA; and TBAH5DTPA;
a scale removal enhancer;
a non-ionic surfactant; and
a hydrotrope,
wherein the composition has a pH ranging from 10 to 11.

### Claim 2 (depends on 1)

The aqueous composition according to claim 1, wherein the hydrotrope is selected from the group consisting of: alkyl glucosides and alkyldiphenyloxide disulfonates.

### Claim 3 (depends on 2)

The aqueous composition according to claim 2, wherein the alkyldiphenyloxide disulfonate is Disodium Hexyl Diphenyl Ether Disulfonate.

### Claim 4 (depends on 2)

The aqueous composition according to claim 2, wherein the alkyl glucoside is a C6-C12 alkyl glucoside.

### Claim 5 (depends on 1)

The aqueous composition according to claim 1, wherein the hydrotrope is a C6-C12 alkyl glucoside selected from the group consisting of: hexyl glucoside; octyl glucoside; decyl glucoside; dodecyl glucoside and combinations thereof.

### Claim 6 (depends on 1)

The aqueous composition according to claim 1, wherein the scale removal enhancer is selected from the group consisting of: potassium carbonate; potassium formate; cesium formate; cesium carbonate; and combinations thereof.

### Claim 7 (depends on 1)

The aqueous composition according to claim 1, wherein the non-ionic surfactant is selected from the group consisting of: linear alcohol ethoxylate surfactants and branched alcohol ethoxylate surfactants.

### Claim 8 (depends on 1)

The aqueous composition according to claim 1, wherein the non-ionic surfactant is a linear alcohol ethoxylate surfactant selected from the group consisting of: alcohol ethoxylate surfactants having a chain length of at least 6 carbon atoms.

### Claim 9 (depends on 1)

The aqueous composition according to claim 1, wherein the scale removal enhancer is present in the composition in an amount ranging from 5 to 20 wt % of the composition.

### Claim 10 (depends on 1)

The aqueous composition according to claim 1, wherein the chelating agent and counterion are present in the composition in an amount ranging from 5 to 40 wt % of the composition.

### Claim 11 (depends on 1)

The aqueous composition according to claim 1, wherein the scale removal enhancer is selected from the group consisting of: K5DTPA; Cs5DTPA; Na4EDTA; and K4EDTA.